Ceria/Lanthanum Silicate Bi-Layer Electrolytes for SOFC Operating at Intermediate Temperatures

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Lanthanum silicate (LS) was used as a blocking layer for preventing the current leakage of gadolinia-doped ceria (GDC) electrolyte. The anode-supported microtubular SOFCs with the GDC/LS bi-layer electrolytes were developed and characterized. The effect of Bi2O3 addition on the sintering characteristic of LS was also investigated. Thermal shrinkage measurement demonstrated that the addition of 5 wt. % Bi2O3 in LS electrolyte (LSB5) led to the decrease in the sintering temperature of the LS and improved the densification of the GDC/LS bi-layer electrolyte. As a result, the OCV for the cell with GDC/LS and GDC/LSB5 bi-layer electrolyte effectively increased in comparison with that of cell with GDC single-layer electrolyte.